Abstract
The polythermal section at a constant composition of 20 mol% BaCl2of the quasi-ternary system BaCl2–BaO–CuOxwas investigated atp(O2)=0.21 bar by means of DTA/TG and soaking experiments. Our results show the nature of incongruent decomposition reactions of the quaternary phases Ba3Cu2O4Cl2and Ba2Cu3O4Cl2atT= 925°C (±5°) andT=975°C (±5°), respectively. Single crystals of both compounds were grown. Furthermore, field-dependent magnetic properties of Ba3Cu2O4Cl2and Ba2Cu3O4Cl2are measured at various temperatures. Both compounds contain two crystallographically different types of magnetic Cu atoms. Ba3Cu2O4Cl2exhibits antiferromagnetic order with a Neél temperatureTNof about 20 K. A spin–flop transition is observed belowTNat a field of 2.6 T. Ba2Cu3O4Cl2shows two antiferromagnetic transition temperatures atTNI≈ 337 K andTNII≈33 K. BelowTNIsome spontaneous magnetization is observed.
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